Manufacture of artificial silk



Patented Oct. 25, 1927.

UNITED srmas EMIL Iil'IiSAIESSElB AND AUGUST HARTMANN, OF BARMEN-LANGERFELD, GERMANY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO AMERICAN BEMBERG CORPORATION; A

CORPORATION OF DELAWARE.

MANUFACTURE OF ARTIFICIAL SILK.

Application filed April 8, 1924, Serial Ifl'o. 705,139, and in Germany December 7, 1923.

For the spinning of artificial silk by the draw-spinning method it is of the utmost importance for the threads to remain as long as they are still soft in a precipitating liquid, which is as quiescent as possible or is only in very slight motion, as they are otherwise easily broken off. In the ordinary spinning apparatus this is effected by the precipitating liquid in the neighbourhood of the spinning rose being contained in a cylindrical vessel of fairly large diameter, so that ayhe precipitating liquid in this part of the pparatus, in which the drawing of the threads mainly takes place, has only a very slow motion. The motion of the threads themselves, however, causes in this part of I the precipitating liquid, besides the m0vement of the latter in the direction of that of the threads, eddying movements, which may cause trouble. The reason for this is that throughthe pull of the threads at portion of the precipitating liquid is drawn downwards along with the threads. This portion must be replaced by other precipitating liquid, which is taken from below-and rises at the sides of the cylindrical vessel. The friction of the two opposing currents causes the said eddying movement.

According to the invention these eddying movements may be totally eliminated, thus causing the drawing operation to take place smoothly and in a perfect manner.

The arrangement forming the subject of the invention comprises an insertion in the spinning tunnel or nozzle, which surrounds the threads and which divides the stream of precipitating liquid. in such a manner that the greater part of the said liquid flows directly to the lower outletfor the finished threads, while only a small quantity of the precipitating liquid flows over the upper edge of the insertion-to the outlet for the threads.

The new arrangement may consist of two funnels one within the other,into the outer one of which the precipitating liquid is' conveyed at-a suitable point. The double tun nel may be surrounded'by a cylindrical casing, at the bottom of which the precipitating liquid is introduced. The liquid rises in the cylindrical casing, the greater part of it flowing away directly through the lower funnel and a small portion through the inner funnel.

In the accompanying drawing:

Fig. I shows a constructional form of the invention diagrammatically,

Fig. 2 another constructionalform.

The'new arrangement consists of a glass cone a, Fig. 1. with an,outlet g. In this cone is a second cone 6, which is maintained in its spaced relation'to the first cone by a perforated annular member h. The second cone b may also be provided with an outlet pipe f, but this latter may be omitted. The inner cone may extend to a greater or less extent into the outer cone, and may terminate at the level of the spinning rose e or some-v what below the same, while the upper edge of the outer cone may terminate below the edge of the inner cone. The exact position of the two edges is immaterial. A hollow casing d surrounds the spinning rose 6 and the upper portions of the two cones a and b.

At a considerable. distance from the outlet opening of the inner cone the outer cone is provided with a pipe 0, through which the precipitating liquid is introduced. The whole apparatus is filled with precipitating liquid, the rose being fittedtightly. On precipitating fluid being caused to flow through the structure it will flow chiefly through the intermediate space between the outer and inner cone towards the outlet opening while in the interior of the inner cone there will either be no downward movement at all or only a venyslight one. On the threads being drawn through the cones, they at first only fall through the quiescent layer in the inner cone and then pass to the outer cone, where they are carried along by the precipltatin'g liquid and conveyed away through the pipe g. By the downward movement of the threads in the inner cone the precipitating liquid is carried along, whichliqiiid is replaced by precipitating liquid from the intermediate space between theouter and inner. cone. This replacing liquid flows uniformly from all sides over the upper edge of the inner cone, a downward flow being immediately imparted to it. Hence, in the interior of the inner cone there is only a slow downward movement of the precipitating liquid, for which reason no eddying motion can take place.

In thesecond constructional form of the new apparatus shown in Fig. 2 the cones a and b are inserted in acylindrical casing e',

to which precipitating liquid flows through a branch 0' at the bottom. The directionot flow-is clearly seen from the figures.

What We claim-is 1. An apparatus for spinning artificial silk threads by the draw spinning method comprising an outer casing, a spinning cone having its upper portion at least within the casing and having a small outlet at the bottom; a member open at both ends having its lower portion inserted in said cone and standing in spaced relation thereto and to said casing and adapted to surround the threads being spun; and means for supplying a precipitating liquid and for keeping the apparatus filled with the same, whereby the flow of the precipitating liquid is divided in such a manner that the main part thereof flows through the free space left between the spinning cone and inserted member to the outlet opening for the' finished threads, while only a small quantity of precipitating liquid flows through the space between the inserted member and the casingto the said outlet Ever the upper edge of the inserted memer. a

2. An apparatus for spinning artificial silk thread by the draw spinning method comprising an outer casing; a spinning cone having its upper portion at least within the casing and having a small outlet at the bottom; a conical member open at both ends having its lower portion inserted in said cone and standing in spaced relation thereto and tosaid casing and adapted-to surround the threads being spun; means for supplying a precipitating liquid and for keepin the ap paratusfilled with the same; an an an? nulus for supporting the conical member, said annulus having perforations therein through which the precipitating liquid can flow to the upper edge of the inserted conical member whereby the flow of the precipitating liquid is divided in such a manner that the main part thereof flows through the free space left between the spinning cone and the inserted member to the outlet opening for the finished threads, while only a small quantity. of precipitating liquid flows through the space between the inserted coni-;

calmember-and the casing-to said outlet over the upper edge of the inserted conical member. l v

3. An apparatus for spinning artificial silk threads by the draw-spinnlng method comprising in combination a cylindrical casing; ayspinning'cone having a small outlet at its lower end supported within the lower portion of said casing; a conical member open at both ends, the lower smaller end whereof extends downwardly into the upper portion of the spinning cone, thawing of said cone and conical member standing in spaced relation to each other and the upper end of said conical member being spaced from the casing; a perforateannulus' located silk, the combination of aspinning rose; a

casing extending downwardly therefrom; a cone having a relatively small discharge opening at its lower end, said cone being supported by the casing with its upper end opening directly into the same; a. second cone-shaped member, the lower portion whereof extends downwardly intothe upper part of the first named cone, the walls of said cones standing in spaced relation to each other; and means for supplying a precipitating liquid to the casing and cones.

In testimony where-of we have signed our names to this specification.

' EMIL ELSAESSER.

' AUGUST HARTMANN. 

